CVE-2026-103246
Deferred Deferred - Pending Action

Credential Ownership Bypass in n8n Exposes Plaintext Secrets

Publication date: 2026-10-01

Last updated on: 2026-10-01

Assigner: VulnCheck

Description
n8n versions before 2.39.6 and 2.40.0 before 2.40.1 fail to validate credential ownership during inline agent node-tool introspection. Attackers can reference arbitrary credential IDs to decrypt and exfiltrate plaintext secrets to attacker-controlled hosts without ownership verification.

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Meta Information

Published
2026-10-01
Last Modified
2026-10-01
Generated
2026-10-01
AI Q&A
2026-10-01
EPSS Evaluated
N/A
NVD
CVE-2026-103246
EUVD
EUVD-2026-90750

Affected Vendors & Products

Showing 3 associated CPEs
Vendor Product Version / Range
n8n n8n to 2.39.6 (exc)
n8n n8n to 2.40.0 (exc)
n8n n8n to 2.40.1 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-639 The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

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Executive Summary

This vulnerability affects n8n versions before 2.39.6 and 2.40.0 before 2.40.1. It allows attackers to reference arbitrary credential IDs without verifying ownership. This enables decryption and exfiltration of plaintext secrets to attacker-controlled hosts.

Detection Guidance

Check n8n version with 'n8n --version' or inspect package.json for version. Look for unexpected credential references in workflow exports or URLs. Monitor network traffic for plaintext secret exfiltration to external hosts.

Impact Analysis

Attackers could access and decrypt any instance credential, including those of the instance owner, even if they are an ordinary member. Plaintext secrets may be sent to external hosts. The vulnerability has a high severity rating with significant confidentiality impact.

Mitigation Strategies

Upgrade n8n to versions 2.39.6 or 2.40.1 or later immediately. Restrict instance access to trusted users only. Rotate all exposed credentials. Audit workflows for unexpected credential references and remove them.

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